我试图让表格单元格在创建新行时显示字符串。但是所有行都是空的。有人知道我在做什么错吗?
这是主要的类:
打包申请;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Cursor;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("/fxml/BasketCase_GUI_0.3.fxml"));
Scene scene = new Scene(root,1110,740);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setResizable(false);
primaryStage.setScene(scene);
primaryStage.setTitle("Basket Case_Beta");
primaryStage.show();
scene.setCursor(Cursor.DEFAULT);
}
public static void main(String[] args) throws Exception {
launch(args);
}
}
这是正常的并且可以正常工作,所以我认为您不必为此担心。
这是控制器类。我认为问题可能出在哪里。
package application;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
public class MainController implements Initializable {
@FXML
TableView<Table> TableID;
@FXML
TableColumn<Table, Integer> aPlayerID;
@FXML
TableColumn<Table, String> aLeague;
@FXML
TableColumn<Table, String> aName;
private int aNumber = 1;
SimpleStringProperty str = new SimpleStringProperty();
public MainController() {
str.set("Hello");
}
final ObservableList<Table> data = FXCollections.observableArrayList(
new Table(aNumber++, "hehe", "hoho"),
new Table(aNumber++, "hehe", "hoho"),
new Table(aNumber++, "hehe", "hoho")
);
public void buttonClick(ActionEvent event) {
data.add(new Table(aNumber++, "hehe", "hoho"));
TableID.getColumns().addAll(aPlayerID, aLeague, aName);
}
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
aPlayerID.setCellValueFactory( new PropertyValueFactory<Table, Integer>("bPlayerID"));
aLeague.setCellValueFactory( new PropertyValueFactory<Table, String>("bLeague"));
aName.setCellValueFactory( new PropertyValueFactory<Table, String>("bName"));
TableID.setItems(data);
}
}
这也是tableviewer所需的表类
package application;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
public class Table {
private final SimpleIntegerProperty bPlayerID;
private final SimpleStringProperty bLeague;
private final SimpleStringProperty bName;
public Table(int cPlayerID, String cLeague, String cName) {
this.bPlayerID = new SimpleIntegerProperty(cPlayerID);
this.bLeague = new SimpleStringProperty(cLeague);
this.bName = new SimpleStringProperty(cName);
}
public int getbPlayerID() {
return bPlayerID.get();
}
public void setbPlayerID(int v) {
bPlayerID.set(v);
}
public String getbLeague() {
return bLeague.get();
}
public void setbLeague(String v) {
bLeague.set(v);
}
public String getbName() {
return bName.get();
}
public void setbName(String v) {
bName.set(v);
}
}
你们知道什么地方可能出错,或者建议我如何只添加tableviewer,使其代码仍可与SceneBuilder的fxml文件的其余部分一起使用?
最佳答案
您的get
方法名称错误。根据PropertyValueFactory
documentation,如果传入属性名称“ xyz”,则属性值工厂将首先在表行中查找属于该对象的方法xyzProperty()
。如果找不到,将重新寻找名为getXyz()
的方法(仔细查看该处的大小写),然后将结果包装在ReadOnlyObjectWrapper
中。
因此,以下方法将起作用:
package application;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
public class Table {
private final SimpleIntegerProperty bPlayerID;
private final SimpleStringProperty bLeague;
private final SimpleStringProperty bName;
public Table(int cPlayerID, String cLeague, String cName) {
this.bPlayerID = new SimpleIntegerProperty(cPlayerID);
this.bLeague = new SimpleStringProperty(cLeague);
this.bName = new SimpleStringProperty(cName);
}
public int getBPlayerID() {
return bPlayerID.get();
}
public void setBPlayerID(int v) {
bPlayerID.set(v);
}
public String getBLeague() {
return bLeague.get();
}
public void setBLeague(String v) {
bLeague.set(v);
}
public String getBName() {
return bName.get();
}
public void setBName(String v) {
bName.set(v);
}
}
但是,如
PropertyValueFactory
文档中所述,这种情况下的属性将不是“活动的”:换言之,如果值更改,则该表将不会自动更新。此外,如果您想使表可编辑,则在没有进行显式连接以调用set方法的情况下,它不会更新属性。最好使用Properties and Bindings tutorial中的轮廓定义表模型:
package application;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
public class Table {
private final IntegerProperty bPlayerID;
private final StringProperty bLeague;
private final StringProperty bName;
public Table(int cPlayerID, String cLeague, String cName) {
this.bPlayerID = new SimpleIntegerProperty(cPlayerID);
this.bLeague = new SimpleStringProperty(cLeague);
this.bName = new SimpleStringProperty(cName);
}
public int getBPlayerID() {
return bPlayerID.get();
}
public void setBPlayerID(int v) {
bPlayerID.set(v);
}
public IntegerProperty bPlayerIDProperty() {
return bPlayerID ;
}
public String getBLeague() {
return bLeague.get();
}
public void setBLeague(String v) {
bLeague.set(v);
}
public StringProperty bLeagueProperty() {
return bLeague ;
}
public String getBName() {
return bName.get();
}
public void setBName(String v) {
bName.set(v);
}
public StringProperty bNameProperty() {
return bName ;
}
}
如果这样做,那么(在Java 8中)您可以使用以下单元格值工厂,而不是
PropertyValueFactory
:aPlayerID.setCellValueFactory(cellData -> cellData.getValue().bPlayerIDProperty());
这将允许编译器捕获任何错误,而不仅仅是在运行时静默失败。